Year % 1995 54.74 1996 55.5 1997 54.78 1998 54.78 1999 55.5 2000 55.5 2001 55.5 2002 54.49 2004 54.54 2005 54.54 2006 54.49 2007 53.58 2008 53.58 2009 53.58 2010 53.58 2011 53.58 2012 52.18 2013 52.18 2014 52.18 2015 52.18 2016 52.18 2017 52.9 2018 52.9 2019 52.86 2020 52.9 2021 52.9